its not 2 pieces, what your seeing is the top of the lip, that's how it sits on the bumper.
you dont need to cut your bumper to fit it, like civicVI said, use some screws to hold it in place, 4 should be enough - 2 on both ends, where the lip bends around in the wheel guard, and another 2 on the inside of the big centre gap beneath the screwhole for the foglights. that way their hidden.
hope that helps mate